Optymalizacaja zapytania Opcje

[GameMaker]

Witajcie !

Poprawiam wyszukiwarkę portalową.
Problem tkwi w tym, że w godzinach szczytu, że zapytanie zaczyna zajeżdżać serwer.

Zapytanie, które jest aktualnie (przykład):

[SQL] pobierz, plaintext 
SELECT SQL_CALC_FOUND_ROWS SQL_CACHE post.id, post.autor, post.date AS newsdate, short_story AS story, post.xfields AS xfields, title, descr, keywords, category, alt_name, comm_num AS comm_in_news, allow_comm, rating, flag, editdate, editor, reason, view_edit, count( search_wordmatch.news_id) AS count FROM search_wordlist, search_wordmatch, post WHERE ( search_wordlist.id = search_wordmatch.word_id AND search_wordmatch.news_id = post.id ) AND ( search_wordlist.word_text = 'układ' OR search_wordlist.word_text = 'zamknięty' ) AND ( category != 13 AND category != 44 AND category != 45 AND category != 46 ) GROUP BY search_wordmatch.news_id ORDER BY count DESC, news_read DESC LIMIT 0,20
 
[SQL] pobierz, plaintext 

Przepisane zapytanie do innej postaci() :

[SQL] pobierz, plaintext 
SELECT SQL_CACHE count( search_wordmatch.news_id) AS kant ,post.id, post.short_story, post.title, post.autor, post.date, post.category, post.comm_num, post.alt_name, post.descr FROM `search_wordlist`
LEFT JOIN search_wordmatch ON search_wordlist.id = search_wordmatch.word_id 
LEFT JOIN post ON post.id = search_wordmatch.news_id WHERE (`category` NOT IN(13,44,45,35,46,53,70)) AND ( search_wordlist.word_text = 'Need' OR search_wordlist.word_text = 'for' OR search_wordlist.word_text = 'speed' ) 
GROUP BY news_id 
ORDER BY kant DESC ,  news_id DESC
LIMIT 0, 20 
[SQL] pobierz, plaintext 

Indexy :

Tabela :

-- search_wordlist

http://scr.hu/1s02/bg4fo

-- search_wordmatch

http://scr.hu/1s02/1fxpz

-- post

http://scr.hu/1s02/tm1s9


EXPLAIN tego zapytania :

http://scr.hu/1s02/ljnq1


Jakie są wasze sugestie odnośnie optymalizacji takiego zapytania.